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butalik [34]
4 years ago
12

22)

Chemistry
1 answer:
Setler79 [48]4 years ago
6 0

Answer: A) 4.2 x 10^20

Explanation:

All of the answers are pretty much the same so it comes down to significant digits.

You always go with the <u>least number of significant digits</u> that you have been given.

So 0.24g only has 2 so our answer will only have 2 significant digits.

If you want to know how to do the math here it is:

Avogadro's Number: 6.022 x 10^23

This number also equals 1 mole.

1 mole of sucrose is equal to 342.3g.

So the equation is set up like this:

0.24g x 1 mol / 342.3 g x 6.022 x 10^23 / 1 mol = 4.2 x 10^20 molecules.

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A student is given a stock solution of 1.00 M NaCl in water. They are asked to make 5 mL of 0.0500 M NaCl. How much of the stock
Harrizon [31]

Answer:

The answer to your question is None of your answers is correct, maybe the data are wrong.

Explanation:

Data

Concentration 1 = C1 = 1 M

Volume 2 = 5 ml

Concentration 2 = 0.05 M

Volume 1 = x

To solve this problem use the dilution formula

             Concentration 1 x Volume 1 = Concentration 2 x Volume 2

Solve for Volume 1

              Volume 1 = (Concentration 2 x Volume 2)/ Concentration 1

Substitution

              Volume 1 = (0.05 x 5) / 1

Simplification

              Volume 1 = 0.25/1

Result

               Volume 1 = 0.25 ml

3 0
4 years ago
The combustion of ethane (C2H6) produces carbon dioxide and steam. 2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(g) How many moles of CO2 are pro
Gwar [14]

Answer: 11.2 moles of CO_2 are produced when 5.60 mol of ethane is burned in an excess of oxygen.

Explanation:

The combustion of ethane is represented using balanced chemical equation:

2C_2H_6(g)+7O_2(g)\rightarrow 4CO_2(g)+6H_2O(g)

As oxygen is preset in excess, ethane acts as the limiting reagent as it limits the formation of product.

According to stoichiometry :

2 moles of propane produces 4 moles of carbon dioxide

Thus 5.60 moles of propane will produce=\frac{4}{2}\times 5.60=11.2 moles of carbon dioxide

Thus 11.2 moles of CO_2 are produced when 5.60 mol of ethane is burned in an excess of oxygen.

6 0
3 years ago
Which one of the following is an example of a monosaccharide?
Andre45 [30]
Glucose is the major example of monosacchrides 
succrose is an example of disaccharide
and both starch and cellulose are examples of polysaccharides
hope that helps :)
3 0
4 years ago
Read 2 more answers
Which one is the answer
SpyIntel [72]

Answer:

The answer is the Third one

6 0
4 years ago
Ill give u brainliest pls help!!<br><br> how is mass of carbon conserved during cellular respiration
Elis [28]

Hi! Glucose and oxygen are required for cellular respiration. As the law of conversation states, in a biochemical reaction, mass is conserved. For every glucose molecule, 6 oxygen molecules are used up and the end products, other than the energy dissipated by the reaction, are 6 water molecules and 6 carbon dioxide molecules. Brainliest?

3 0
3 years ago
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